About this product
Part Number: 10101152
In 99% of cases, the 10 lines per millimeter version is the one to choose :-)
This handy accessory will help you to check the quality of the optics of most telescopes.
Although all aberrations of an optic can be seen in a star test it requires steady air and lots of experience. The Ronchi star test works well with medium quality seeing and is easier for the beginner to perform an accurate analysis of a telescope after only a short period of learning!
Some gratings from other manufacturers are made of exposed film or laser printouts with gratings that show inferior contrast so are more difficult to analyse! This Ronchi eyepiece is equipped with a vacuum-metalized chrome on glass grating with either 5 or 10 lines per millimeter. The grating is on the telescope side of the glass and is in precisely the same plane as the outer stop.
The Ronchi Eyepiece is made from black anodised Aluminium with a 1.25" barrel and is supplied in a protective housing with a short manual in English.
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